Using pear variety Lvbaoshi as the material, selecting the young fruits on the representative fruit branches on the east, south, west and north, GA3, GA4＋7 and GA3 ·GA4＋7 were smeared on fruit stalk, the effects of different types of gibberellic acid on the fruit setting rate, fruit size, single fruit weight, yield, quality and mature period of pear were studied. The results showed that gibberellic acid could significantly increase the fruit setting rate, obviously promote the fruit expanding and ripeness, and increase the yield. There were differences among different gibberellic acid treatments. Comparing with the control （water）, GA4＋7 and GA3 · GA4＋7 eotdd increase the soluble sugar content, and decrease the titratable acid content. GA3 could increase the titratable acid content, and it had little influence on the soluble sugar content. The soluble solid content was significantly decreased with gibberellic acid, and that with GA3 was lower significantly than that with GA4 ＋7 and GA3 · GA4＋7. The Ve content%以绿宝石梨品种为试材,在花瓣脱落后20～30 d,将东、南、西、北方位上选取的4个有代表性果枝上的所有幼果,分别用GA3、GA4＋7和GA3.GA4＋7脂膏涂抹果柄中部,研究不同类型赤霉酸对梨坐果率、果实大小、单果重、产量和品质以及成熟期的影响。结果表明：3种赤霉酸处理均能显著提高坐果率,明显促进果实膨大和提早成熟,并提高产量,但不同类型赤霉酸对果实品质的影响存在一定差异。与清水对照相比,涂抹GA4＋7和GA3.GA4＋7能明显提高果实的可溶性糖含量,而涂抹GA3显著提高了可滴定酸含量而对果实可溶性糖含量影响不大;涂抹GA4＋7和GA3.GA4＋7可使果实的可滴定酸含量降低,但是仅2.7%GA3.GA4＋70.54 mg/kg处理与对照间的差异达到了显著水平,而2.7%GA4＋70.27 mg/kg和2.7%GA3.GA4＋70.27 mg/kg处理与CK差异均不显著;涂抹参试的3种GA均导致果实Vc和可溶性固形物含量显著降低,其中GA3处理的果实可溶性固形物含量显著低于GA4＋7和GA3.GA4＋7处理,而不同类型GA处理的果实Vc含量差异均不显著。在梨树生产上,为了提高梨果产量、提早上市和增加含糖量,宜选用GA4＋7和GA3.GA4＋7。且该药剂对梨生长安全,无药害现象。
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